What movie am i thinking of?

what s that kids movie about the monsters who go to houses and make **** dirty, but the son doesn t want to make things dirty so he goes and befriends the human kid? i ve been thinking about this for way too long now and i cant find anything. there s a whole musical number that the monster son does about how he... show more what s that kids movie about the monsters who go to houses and make **** dirty, but the son doesn t want to make things dirty so he goes and befriends the human kid? i ve been thinking about this for way too long now and i cant find anything. there s a whole musical number that the monster son does about how he wants to be clean.
Update: the movie was mostly live action irc except for the monsters (which may not be the right word to use here but i lack a better one) who were probably cgi and not practical effects.
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